Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff952b10541039f0…

MALICIOUS

PDF

44.6 KB Created: 2020-11-08 22:47:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-02-23
MD5: 3d2da4d29a22f67d7a2e8bad1a388694 SHA-1: 50d8a5065cafcce819aecf36da7914ee90d0093e SHA-256: ff952b10541039f0ac2965fa820767520938c7488fca708eb62a90a0075bf257
136 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffi.ru/aws?keyword=vtmb+mods+brujah PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379500/normal_5fa5c7dad181c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370066/normal_5f8b5d1398df5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392861/normal_5fa40d78acc72.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5f9191078b766.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367275/normal_5f89e9270f48c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368228/normal_5f8ba39333cd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404121/normal_5f91ee20815cd.pdfIn PDF document text
    • https://judemozosuduj.weebly.com/uploads/1/3/4/3/134306717/nakirupiginatomekir.pdfIn PDF document text
    • https://rabugotekinevod.weebly.com/uploads/1/3/1/8/131871666/553845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/caaf66df-0318-4d49-a0a6-dc06e3c557ef/21720247167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6930c1e3-5812-48d1-8df8-6ae9590d3e37/stardew_valley_multiplayer_mod_5_players.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e2f4e91-a95c-4d28-b4c2-c50ac6dfedd7/2222721276.pdfIn PDF document text
    • https://s3.amazonaws.com/lanowilovuviwib/manual_dimming_rear_view_mirror.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e182618d-d8ff-44ac-aba5-50bfcd4ccd74/few_things_left_unsaid_file.pdfIn PDF document text
    • https://s3.amazonaws.com/tadovu/regap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5638368b-0710-462f-8655-1feb550d933b/20777067096.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006279.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6279 4824 bytes
SHA-256: 8151230abf8340070c87b0fd3c8ab8e999c7c7d58772cfe1b9e1e03fc76493a7
font_01_sfnt_off000072da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72DA 10816 bytes
SHA-256: 1e37c7d68cbc8fdb0e7a05616e9380ba7ab45ae537cc678a7ccdff9182bea684
font_02_sfnt_off000097a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A7 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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